class Foo {
  var val;
  
  property p {
    getter {
      return val;
    }
    setter(v) {
      this.val = v;
    }
  }
  
  function finalize() {
    System.inform("finalize(): " + this);
  }
}

var foo = new Foo();
foo.p = 123;
System.inform(foo);
System.inform(typeof foo);
System.inform(foo.p);
// var foo.bar = 'quux';    // can't do this
foo.bar = 'quux';           // can dynamically add members
System.inform(foo.bar);
(function () {
  System.inform(this.bar);
} incontextof foo)();
delete foo.bar;             // can dynamically remove members
// (function () {
//   System.inform(this.bar);
// } incontextof foo)();    // member not found, exception
invalidate foo;             // deterministically destroy object (like C++'s delete operator)
System.inform(isvalid foo); //=> 0